/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.camunda.bpm.engine.rest.helper;

import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

/**
 * Default answer for Mockito mocks to always return themselves if the method return type matches.
 * Can be used to mock fluent APIs more easily.
 *
 * @author Thorben Lindhauer
 */
public class FluentAnswer implements Answer<Object> {

  @Override
  public Object answer(InvocationOnMock invocation) throws Throwable {
    Class<?> returnType = invocation.getMethod().getReturnType();

    Object mock = invocation.getMock();
    if (returnType.isAssignableFrom(mock.getClass())) {
      return mock;
    }
    else {
      return null;
    }
  }
}